Callosity n. : A hard or thickened spot or protuberance; a hardening and thickening of the skin or bark of a part, eps. as a result of continued pressure or friction.

Example:
Blister/Callosity on the sole of my foot?!?

Taxonomy
ischial callosities, Callosity, right whales, free encyclopedia, whale, skin, Steudel, species, appearance, females, Monkeys, the monkeys, search, friction, buttocks, sleep, sitting, upright.

Defination from the web: